For an LCR circuit, the power transferred from the driving source to the driven oscillator is `P = I^(2) Z cos phi`.

Options

A. here, the power factor cos `phi ge 0, P ge 0.`
B. The driving force can give no energy to the oscillator (P = 0) in some cases.
C. The driving force cannot syphon `(p lt 0)` the energy out of oscillator.
D. The driving force can take away energy out of the oscillator.

Answer

a,b,c

Explanation

The power transforred is given by
P = `I^(2) Z cos phi`
Thw power factor cos `phi ge ` 0.
`therefore p ge ` 0
in case of wattles component, P = 0 if `phi` = 90.
therefore, the driving force can given no energy to the oscillator.
P cannot be nagetive `epsilon`. so, the driving force cannot syphon out the energy out of oscillator.
Options (a) , (b) and (C) are correct .